Brake drum



J. W. WHITE BRAKE DRUM Filed Sept. 16, 1931 Dec. 31, 1935.

2 Shets-Sheet'l |NVE-NTR 122171196 6? 1/1556 WMMM ATTORNEYS Dec. 31,1935. J. w. WHITE 2,026,263

BRAKE DRUM Filed Sept. 16, 1931 2 Sheets-Sheet 2 Y {dz/711222222777 W256WM ,W/Vm $14M ATTO R N EYS Patented Dec. 31, 1935 UNITED STATES BRAKEDRUM John William White, Detroit, Mich., minor, by

assignments, to The Kelsey-Hayes Wheel Company, Detroit, Mich, acorporation of Delaware Application September 16, 1931, Serial No.583,195

12 Claims.

The invention relates to brake drums-and refers more particularly tocomposite brake drums for use with motor vehicles. One of the objects ofthe invention is to provide a brake drum having a backing member and anannular flange member with an improved mounting on the former for thelatter. Another object is to so mount the annular flange member on thebacking member that the former is interlocked with and held from axialdisengagement from the latter, but may expand radially. These and otherobjects of the invention will become apparent from the followingdescription, taken in connection with the accompanying drawings, inwhich Figure 1 is a radial section through a portion of a brake drumshowing an embodiment of my invention;

Figures 2 and 3 are cross sections; respectively,

I on the lines 2-2 and 3-3 of Figure 1;

Figures 4, 6, and 8 are views similar to Figure 1 showing otherembodiments of my invention;

Figure 5 is a cross section on the line 5-5 of Figure 4:

Figure '7 is a plan view of Figure 6;

Figure 9 is an elevation of Figure 8.

The brake drum, as shown in Figures 1, 2, and 3, comprises the radiallyextending sheet metal backing member iand the annular flange member 2,which is formed of cast metal. This annular flange member has theaxially extending body 3 forming the brake engaging member and issuitably reinforced as by means of the outwardly extending annular rib4, which latter also serves in cooling thebrake drum.

The backing member i is circular and is provided at its periphery withthe spaced axially extending dove-tailed projections 5 which taper inwidth from their front to their rear edges and each of which has itsopposite sides 6 extending parallel to the radial plane passing axiallythrough its center. The annular flange member 2 has at its rear edge andprojecting from its inner surface the cooperating axially extendingdovetailed projections 1 fitting the projections 5 and located in therecesses therebetween, the annular flange member also having between theprojections 1 recesses into which the projections I fit. The annularflange member'has the radially extending shoulder 8 formed between eachpair of adjacent projections I for preventing axial disengagement of theannular flange member from the backing member by a movement of theformer in-a rearward direction, the dove-tailed projections 5 and 'lpreventing axial separation in the opposite direction.

The annular flange member is assembled with the backing memberpreferably by casting the annular flange member upon the backing memberunder pressure greater than that produced by the weight of the materialforming the annu- 5 lar flange member, so that the mold in which theannular flange member is formed will be completely filled, assuringproperly forming the annular flange member. In this connection it is tobe noted that the annular flange member is 10 cast upon the backingmember when the latter is cool so that fusing of the flange with thebacking member is prevented and radial expansion of the annular flangemember is unrestricted.

In the modification shown in Figures 4 and 5 the backing member 9 ispreferably formed of sheet metal and extends radially and is circularand has at its periphery the axially extending dove-tailed projectionsill with alternate projections taperingin width axially of the brake 2odrum in opposite directions. The opposite sides of these projectionsextend parallel to the radial plane passing axially through the centersof the respective projections. The annular flange member Ii has at therear edge of its body the radig5 ally inwardly extending annular flangeI! which is formed with the projections l3 fitting between theprojections l0 and providing recesses for receiving these latterprojections. The annular flange member is cast upon the backing mem- 30ber. In this construction the cooperating projections and recesses,alternate ones of. which are tapered in width in opposite directions,serve to hold the annular flange member from axial movement in eitherdirection relative to the back- 3:, ing member.

In the modification shown in Figures 6 and 7, the backing member i4 ispreferably formed of sheet metal and is circular and has at itsperiphery the spaced transverse or axially extending 40 projectionsv itformed by bending over the same. These projections taper in width fromtheir front to their rear edges and each has its opposite sides parallelto the radial plane passing axially through its center. member l6 has atthe rear edge of its body the cooperating projections i i and recessesfor fitting the projections i5 and the projections I'I overlap the bodyportion i8 of the backing member. This annular flange member is alsocast upon the 50 backing member.

As shown in Figures 8 and 9, the backing member i 9 is preferably formedof sheet metal and is circular and has at its periphery the spacedradially extending projections or splines 20, the 55 The annular flange45oppositesidesoieachoiwhichcxtendparalleltotberadiaiplanepassingthroughthcirl'lpcctive centers. 'lheannular flangemember ii is.prererablyrormedoieastmetalandhastheann encircling ribs 22 providingrigidity and heat 'radiationandtheinnercylindrical brake engaging race28. This annular flange member bssattherearedgeoiitsbodytheradiallyextending cooperating projections or splines 24 forfltting in the recesses between the projections or splines ill, thelatter fltting in the recessesbetween the projections or splines 24. Tosecure the annular flange member to the bacldng member, I provide theaxially extending studs 28, which are threaded into the body of theannular flange member and extend ireeiy through certain of theprojections or splines II. and the nuts 20 threaded upon these boltsthewashers 21 being preferably located between the nuts and the backingmember. The bolt holes in the projections or splines 20 are elongatedradially and the nuts are tightened down sufliciently to hold theannular flange member and backing member together without play, butlaallow radial expansion oi the annular flange mem er.

From the above description, it will be readily seen that the annularflange member may be formed oi suitable material to provide a brakeengaging member having a good wearing surface. Itwill also be seen thatthe mounting for the annular flange member upon the backing member issuch that the annular flange member is held from disengagement from thebacking member in both axial directions and that the annular flangemember may expand radially relative to the backing member and isaccurately centered thereon at all times.

What I claim as my invention is:

l. A brake drum, comprising a backing member and a continuous annularflange member permanently flxed on and having'a dove-tailed connectionwith said backing member preventing relative movement of said members inan axial direction and providing for radial expansion of said flangemember relative to said backing member. I

2. A brake drum, comprising a bacldng member mid a continuous annularflange member mounted on and having an axially extending inter-lockingpermanent connection with said backing member preventing relative.movement of said members in an axial direction and providing forrelative expansion and contraction of said members in a radialdirection.

3. A brake drum, comprising a backing member and a continuous annularflange member mounted on and having an axially extending p rmanentdove-tafled connection with said backing member preventing relativemovement of said members axially oi the drum and providing for relativeexpansion and contraction or said members in a radial direction.

4. A brake drum, comprising a backing mem-' ber and an annular flangemember mounted on said backing member, said backing and flange membershaving interfltting dove-tailed projections and recesses providing forradial expansion or said flange member relative to said backing member,each projection tapering in widthaxiallyoithebrakedrumandhavingitsoppositc Qfii'f extending dove-tailedprojections and said flange member having cooperating inwardly extendingdove-tailed proiecm tions on its inner face for holding said web andflange members from axial movement in one direction, and a shouldercooperating with said backing member for holding said backing and flangemembers from axial movement in the 1s opposite direction.

6. A brake drum. comprising a backing member and an annular flangemember mounted on said backing membe said backing and flange membershaving cooperating dove-tailed projecgo tions and recesses for securingthe two together, certain oi said projections tapering in width in onedirection and certain other oi. said projections tapering in width inthe opposite direction.

7. A brake drum, comprising a backing member as and an annular flangemember mounted on said backing member, said backing and flange membershaving cooperating axially extending dovetailed projections and recessesi'orv securing the two together, the alternate projections tapering inso width in opposite directions.

8. A brake drum, comprising a radially extending backing member havingat its periphery transversely extending dove-tailed projections and acontinuous annular flange member overlapping said backing member andhaving recesses for receiving said projections preventing relativemovement or said members axially oi. the drum and providing for relativeexpansion and contraction of said members in a radial direction. 40

9. A brake drum, comprising a backing member and an annular flangemember having cooperating projections and recesses with their oppositesides extending substantially parallel to radial planes passing throughtheir centers providing for relative expansion and contraction of saidmembers in radial directions.

10. A brake drum, comprising a backing memher, an annular time membercast upon the backing member, and means permanently connecting thelatter to the former arranged to provide for radial expansion 01 thelatter relative to the former.

11. A brake drum, comprising a backing member and an annular flangemember cast upon the 6! backing member and having a permanent axiallyextending interlocking connection with said backing member providing forradial expansion or the annular flange member relative to the backingmember. a

12. A brake drum, comprising a backing member and a continuous annularflange member mounted on and having an axially extending dove-tailedconnection with said member arranged to provide for radial expansion oithe 6 annular flange member relative to the backing member.

JOHN WIILIAM WHITE.

